Digital data processing circuit

Abstract

A digital data processing circuit includes: an output unit configured to output to an audio signal processing circuit change data for changing a receiving frequency of a FM receiving device as a first frequency to a second frequency in response to an instruction signal providing an instruction to change the receiving frequency to the second frequency, the audio signal processing circuit being a circuit configured to modulate a carrier wave having the first frequency corresponding to setting data with a modulation signal corresponding to an audio signal to be reproduced by the FM receiving device and to the change data, and transmit the modulated carrier wave to the FM receiving device; and a setting unit configured to set the setting data so as to change a frequency of the carrier wave to the second frequency after the output unit outputs the change data to the audio signal processing circuit.

1. A digital data processing circuit comprising:
 an output unit configured to output to an audio signal processing circuit change data for changing a receiving frequency of a FM receiving device from a first frequency to a second frequency in response to an instruction signal providing an instruction to change the receiving frequency to the second frequency, the audio signal processing circuit configured to modulate a carrier wave having the first frequency corresponding to setting data with a modulation signal corresponding to an audio signal to be reproduced by the FM receiving device and to the change data, and transmit the modulated carrier wave to the FM receiving device; and 
 a setting unit configured to set the setting data so as to change a frequency of the carrier wave to the second frequency after the output unit outputs the change data to the audio signal processing circuit. 
 
     
     
       2. A digital data processing circuit comprising:
 a setting unit configured to set setting data on an FM signal processing circuit based on change data from the FM signal processing circuit configured to demodulate an FM signal having a first frequency corresponding to the setting data to extract an audio signal and the change data, the setting data being data for setting a receiving frequency of the FM signal processing circuit to a second frequency, the change data being data for changing the receiving frequency to the second frequency.